Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Sep. 30, 2015
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,713	$ 7,723
Accumulated Amortization	1,048	903
Unamortized intangible assets	203	205
Acquired in-process research and development
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized intangible assets	201	203
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized intangible assets	2	2
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,370	3,370
Accumulated Amortization	176	120
Developed technology
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,478	3,487
Accumulated Amortization	572	510
Product rights
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	125	128
Accumulated Amortization	37	35
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	405	405
Accumulated Amortization	31	26
Patents and other
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	335	333
Accumulated Amortization	$ 232	$ 212